Export Template - How to access the related IP address for a Service?

[graphworlok]

I'm attempting to automate generation of a nagios service configuration file using Export Templates, and i don't seem to be able to access the related IP data - instead it returns the string "ipam.IPAddress.None"

I've also tried service.ipaddresses.address (returns nothing) and service.ipaddresses[0].address (errors)

Template is assigned to IPAM | service

{% for service in queryset %}{% if service.device %}
define service {
    use                     netbox-service ; Name of service 
    host_name               {{ service.device.name }}
    service_description     {{ service.description }} {{ service.comments }}
    check_command           {{ service.check_command }}
    PORT  {{service.ports[0] }}
    IP      {{ service.ipaddresses }}
}
{% endif %}
{% endfor %}

[graphworlok]

I was able to access the required data via service.ipaddresses.all()